It's worth noting that the Black Ops Servers are no longer saving progress so if you've not played before you're going to need to start with a couple of regular multiplayer matches to get the needed Cod Points, you only need 100 to enter the wager matches but having more is recommended, the next challenge is finding a lobby, 5 wins aren't required but finishing in the top 3, this can be challenging depending on how good a player you are as there are 6 players including yourself, gun game is recommended as that's the game mode people play the most, once you've finished your 5th game in the top 3 you need to wait for the match to return to the lobby then the trophy should be yours.